HEV型静态混合器翼片结构优化研究

Research on Optimization of Wing Structure in an HEV Static Mixer

运用FLUENT软件,对4种不同翼片长度的HEV型静态混合器内液液两相流动的流速场和压力降进行数值模拟,并计算混合不均匀度系数值.结果表明:随着翼片长度由0.33 D(模型一)增大为0.59 D(模型四),翼片后方形成漩涡的影响区域不断增大,混合器出口处混合不均匀度系数值逐渐减小,至0.01以下,混合效果增强;但同时,混合器出口压力降逐渐增长至模型一的2.3倍.因此,对翼片的结构进行了改进.改进结果表明:新结构混合器出口处混合不均匀度系数为0.028,混合效果良好,且新结构混合器压降是模型四压降的1/2左右,与模型一的压降相当.

FLUENT software is used to simulate the flow field and pressure drop of liquid-liquid two-phase flow in HEV static mixer with four different fin lengths,and calculate the coefficient value of mixed inhomogeneity.The results show that as the length of the fins increases from 0.33 D(model 1)to 0.59 D(model 4),the influence area of the swirl formed behind the fin increases and the mixing coefficient at the outlet of the mixer gradually decreases to 0.01,the mixing effect is enhanced;but at the same time,the pressure drop at the outlet of the mixer gradually increases to 2.3 times of model 1.Therefore,the structure of the fin has been improved.The comparative study found that the mixing coefficient at the outlet of the new mixer is 0.028,and the mixing effect is good.The pressure drop of the new mixer is about 1/2 of the pressure drop of the model 4,which is equivalent to the pressure drop of the model 1.